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Why is quantum key distribution so secure?

Johannes Handsteiner explains the principles of quantum key distribution (QKD) and why – in theory – it is significantly safer than classical secure communication protocols. While working at the Institute for Quantum Optics and Quantum Information (IQOQI) in Vienna, Austria, Handsteiner tested a form of QKD based on entangled photons.

The interview was recorded in 2019 before the COVID-19 pandemic. Handsteiner now works at Quantum Technology Laboratories, a company involved in contract research using QKD.

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